Pneumatic-tire pressure gauge



Patented Feb. 3, 1925.

. ETED TATES PATENT OFFICE.

HAEGLD J'. LE VESCONTE, OF CHARLESTON, 'tE/'EST VTR-GINIA, ASSIGNOR, BY MESNE ASSIGNMENTS, TO TIREGAGE VALVE CORPORATION, OF CHARLESTON, WEST VIR- G-INIA, A CORPORATION OF -WEST VIRGINIA.

PNEUMATIC-TIRE PRESSURE GAUGE.

Application filed October ao, 1922. Serial No. 5973745.

To all whom it may co 'ce m:

Be it known that I, HAROLD J. LE VES- CONTE, a citizen of the United States, residing at Charleston, in the County of Kanawha and State of West Virginia, have inventecl new and useful Improvements in Pneumatic- Tire Pressure Gauges, of which the following is a specification.

This invention is designed to improve the Construction of pneumatic tire stem pres-- sure gauges, particularly the type ot' pressure gauges having a movable plunger in- -dicating the pressure and an expansible tube continuing the conduit through the plunger to the stem. With such constructions it is common to resistthe movement of the plunger by means of a spring. These gauges being mounted in pneumatic tire stems necessarily have very limited space. The present invention is directed to a means of connecting the spring to the plunger which simplifies this attachment.

The invention is illustrated in the accompanying drawings as fo1lows:-

Fig. 1 shows a vertical section through the pressure gauge. c

Fig. 2 an enlargedview of the end of the plunger.

1 marks the stem. This is screwed into a screw-threaded socket in the head 2. A clamping plate 3 opposes the head in the usual manner. A spreader plate 4 is arranged over the clamping plate and a clamping nut 5 exerts clamping action on the clamping plate. The plunger 6 has a conduit 7 extending through it in which is arranged the usual infiaton valve 8. The end of the plunger is screw-threaded making it suitable for receiving the unp and the usual cap 9 is screwed on to the end of the plunger when in normal use. The plunger is provided with a key-way 10 which engages a depression 11 in the stem to prevent it from turning so as to receive the pump as it is screwed into place. These features have heretofore been used in pressure gauges of this type.

The plunger has a reducecl extension l2 on its lower end over which a tube 13 is placed, the tube being Secured in place on the extension by a wrapping i& which binds the tube to the extension, the extension having preferably a shoulder at its end to faciltate the securing of the tube. The

lower end of the tube is arranged over a reduced extension 15 on an anchor piece 16 by a wrapping 17, the anchor piece extending into a tapered opening 18 in the head 2 so as to make a closure at this point. The anchor piece has an opening 19 through it communicating with the tube 13.

A spring 20 is screwed on to a screwthreacled shoulder 21 on the anchor piece and the upper end of the spring is contracted at 22 so as to engage the upper end of the tube 13 so that the securing of the tube to the extension also secures the spring on the extension. The wrapping of the tube in binding it to the reduced extension forms a shoulder 23 at its end which is engaged by the contracted coils of the spring. The contraction of the coils may be accomplished prior to the placing of the spring over the tube, the coils being expanded for this purpose or the coils may be contracted into 'place after the spring is in place on the plunger. This method of attachment not only makes one of Simplicity and convenience, the plunger being provided with no securing feature for the spring itself but at the same time permits of a closa relation between the expansible tube and the spring. I

It will be noted that the bottom of the keyway 10 is above the edge of the threads on* the end of the plunger. This facilitates the forming of the key-way.

What I claim as new is 1. In a pneumatic tii-e pressure gauge, the combination of a hollow stem; a plunger slidingly mounted in the stem and indicating by its movement the gauge pressure, said plunger having a conduit therethrough an expansible tube Secured to the plunger; and a spring Secured to the plunger through engagement with the .tube and ressting the movement of the plunger.

2. In a pneumatic tire pressure gauge, the combination of a hollow stem; a plunger slidingly mounted in the stem and indicating by its movement the gauge pressure, said plunger having a conduit therethrough; an expansible tube having its end Secured to the plunger; and a spring resisting the movement of the plunger Secured to the plunger through engagement with the end of the tube that is Secured to the plunger.

3. In a. 'pneumatic tirepressure gauge, the combineon of 'a hollow stem; a plunger slidigly mounted in the steni and indicating by its movement the gauge pressu'e, said phmger having a Conduit therethrough; zin expansb le tube having its end Secured to the plunger; and a coil spring Secured to the phnger through engagemen With the tube by having coils contracted to engage the end of the tube.

4. In a pneumatie ti'e piressure gauge, the eonibination of a hoilow stem; a phinger sliding y mounted in the stein; an expensib e tube having its end seem-ed to the piunge', the end of the tube being provided With a shoulder; and a eoil spring arranged over the tube and secured'to the 'plunger through'engegement With the tube by having coils connected to enguge the shoulder on the tube.

5. In e pneunatic ii'e pressm'e gauge, the combination of a hollow stein; a plunger slidingiy mounted in* the sten' and indicating by its movement the gauge P'essure, said plunger having a Conduit thereth'ough and a reduced. extension on its lower end; a 'ubber tube ar'anged over the extension and Secured fliei'een; and a coil spring resisting the movement of the plunge' and ar'anged over the tube and seemed to the plunger "through engigeinent With the tube by having a eoil connected to eng-agethe end of the tube.

In testimony whereofhave my hand.

HABOLD J. LE VESCONTE.

he'eunto set 

